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Regx support for postgres dump #62

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Regx support for postgres dump #62

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9778f5f
Regx support for postgres dump
sriniarul Jun 30, 2021
cda9333
Regx support for postgres dump
sriniarul Jun 30, 2021
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50 changes: 36 additions & 14 deletions ln2sql/database.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,15 +83,16 @@ def _generate_path(path):
def load(self, path):
with open(self._generate_path(path)) as f:
content = f.read()
flag=re.search("(\w+)", content).group(0)=='PostgreSQL'
tables_string = [p.split(';')[0] for p in content.split('CREATE') if ';' in p]
for table_string in tables_string:
if 'TABLE' in table_string:
table = self.create_table(table_string)
table = self.create_table(table_string,flag)
self.add_table(table)
alter_tables_string = [p.split(';')[0] for p in content.split('ALTER') if ';' in p]
for alter_table_string in alter_tables_string:
if 'TABLE' in alter_table_string:
self.alter_table(alter_table_string)
self.alter_table(alter_table_string, flag)

def predict_type(self, string):
if 'int' in string.lower():
Expand All @@ -103,21 +104,31 @@ def predict_type(self, string):
else:
return 'unknow'

def create_table(self, table_string):
def create_table(self, table_string, flag):
lines = table_string.split("\n")
table = Table()
for line in lines:
if 'TABLE' in line:
table_name = re.search("`(\w+)`", line)
table.name = table_name.group(1)
if flag:
table_name = re.search(r'(?<=public.)\w+', line)
table.name = table_name.group(0)
else:
table_name = re.search("`(\w+)`", line)
table.name = table_name.group(1)
if self.thesaurus_object is not None:
table.equivalences = self.thesaurus_object.get_synonyms_of_a_word(table.name)
elif 'PRIMARY KEY' in line:
primary_key_columns = re.findall("`(\w+)`", line)
if flag:
primary_key_columns = re.findall("PRIMARY KEY \((\w+)\)", line)
else:
primary_key_columns = re.findall("`(\w+)`", line)
for primary_key_column in primary_key_columns:
table.add_primary_key(primary_key_column)
else:
column_name = re.search("`(\w+)`", line)
if flag:
column_name = re.search("(\w+)", line)
else:
column_name = re.search("`(\w+)`", line)
if column_name is not None:
column_type = self.predict_type(line)
if self.thesaurus_object is not None:
Expand All @@ -127,22 +138,33 @@ def create_table(self, table_string):
table.add_column(column_name.group(1), column_type, equivalences)
return table

def alter_table(self, alter_string):
def alter_table(self, alter_string, flag):
lines = alter_string.replace('\n', ' ').split(';')
for line in lines:
if 'PRIMARY KEY' in line:
table_name = re.search("TABLE `(\w+)`", line).group(1)
table = self.get_table_by_name(table_name)
primary_key_columns = re.findall("PRIMARY KEY \(`(\w+)`\)", line)
if flag:
table_name = re.search(r'(?<=public.)\w+', line).group(0)
table = self.get_table_by_name(table_name)
primary_key_columns = re.findall("PRIMARY KEY \((\w+)\)", line)
else:
table_name = re.search("TABLE `(\w+)`", line).group(1)
table = self.get_table_by_name(table_name)
primary_key_columns = re.findall("PRIMARY KEY \(`(\w+)`\)", line)
for primary_key_column in primary_key_columns:
table.add_primary_key(primary_key_column)
elif 'FOREIGN KEY' in line:
table_name = re.search("TABLE `(\w+)`", line).group(1)
table = self.get_table_by_name(table_name)
foreign_keys_list = re.findall("FOREIGN KEY \(`(\w+)`\) REFERENCES `(\w+)` \(`(\w+)`\)", line)
if flag:
table_name = re.search(r'(?<=public.)\w+', line).group(0)
table = self.get_table_by_name(table_name)
foreign_keys_list = re.findall("FOREIGN KEY \((\w+)\) REFERENCES public.(\w+)\((\w+)\)", line)
else:
table_name = re.search("TABLE `(\w+)`", line).group(1)
table = self.get_table_by_name(table_name)
foreign_keys_list = re.findall("FOREIGN KEY \(`(\w+)`\) REFERENCES `(\w+)` \(`(\w+)`\)", line)
for column, foreign_table, foreign_column in foreign_keys_list:
table.add_foreign_key(column, foreign_table, foreign_column)


def print_me(self):
for table in self.tables:
print('+-------------------------------------+')
Expand Down